/* comparetimeofday.c
 *
 * Compare the /proc/xtime output of xtime.tv_sec and xtime.tv_usec with
 * the result from gettimeofday system call.
 */

/* Standard include files for syscall, see man syscall */
#include <stdio.h>               /* for printf */
#include <sys/time.h>            /* for gettimeofday */
#define MAXLINE 80

int main(void)
{ char buf[MAXLINE+1];  /* room for string terminator zero */
  FILE *fp;
  struct timeval now;

  fp = fopen("/proc/xtime", "r");

  printf("The xtime from /proc/xtime is the following:\n");
  /* fgets reads one less than specified number of chars and adds zero */
  while (fgets(buf, MAXLINE+1, fp) != NULL )
  { printf("%s", buf);
  }

  printf("\nThe result of gettimeofday system call is:\n");
  gettimeofday(&now, NULL);
  printf("now.tv_sec: %ld  now.tv_usec: %ld\n",
             now.tv_sec, now.tv_usec );

  return 0;
}